种植绿肥对作物产量和细菌群落稳定性的影响

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Abstract In order to provide theoretical support for the effects of reducedfertilizer in hairy vetch-wheat/oilseed rape rotation system on crop production and soil fertility in Qinghai Plateau. a location field experiment about hairy vetch-wheat/oilseed rape rotation established in 2011 was used in this study. The experiment including eight treatments, e.g., only green manure (GF0), green manure and 60% of chemical fertilizer (GF60), green manure and 70% of chemical fertilizer (GF70), green manure and 80% of chemical fertilizer (GF80), green manure and 90% of chemical fertilizer (GF90), green manure and 100% of chemical fertilizer (GF100), only 100% of chemical fertilizer (F100), and the no-fertilizer control (F0). The wheat and oilseed rape yields, soil properties and microbial community structures were measured. Results showed that the green manure-wheat/oilseed rape rotation system could reduce about 30% chemical fertilizer without reduction of wheat and oilseed rape yields, when compared with F100. Green manure combined with reduced chemical fertilizer improved soil fertility, especially increasingthe contents of soil organic C and total N by 1.34%~7.46% and 2.16%~7.48%, respectively.Green manure combined with reduced chemical fertilizer increased the diversity of soil microbial, and the most abundant phyla were Acidobacteria and Proteobacteria. The results of co-occurrence networks showed that green manuring increased the percentages of negative correlations andmodularity of the networks, indicating that application of hairy vetch as green manure increased the stability and anti-jamming capability of the bacterial communities. The network roles suggested that utilization of green manure increased the keystones in the bacterial community. It was concluded that the microbial diversity and abundance were affected by the cropping system and fertilization amounts. The utilization of green manure can reduce 30% of chemical fertilizer without reduction of wheat and oilseed rape yields. The reduced fertilizer amount could be a reference to the local fertilizer management practices and will give a theoretical support for this agricultural system.

Key words： hairy vetch reduced fertilizer microbial community co-occurrence networks keystones

Received: 02 April 2021

PACS:	X171.5
	X172

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	HAN Mei
	LIU Rui
	LI Zheng-peng
	YAN Qing-biao
	SUN Xiao-feng

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HAN Mei,LIU Rui,LI Zheng-peng等. Green manuring increased crop yields and the stability of bacterial community[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5382-5390.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I11/5382

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